Twist drill and socket.



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Z/z/z'zh 55555.5 76 $55.52? 5 7V W UNITED STATES PATENT orrion.

ARTHUR L. BEARDSLEY, OF CHICAGO, ILLINOIS, AND ANDREW H. BEARDSLEY, OF ELKHART, INDIANA.

Specification of Letters Patent.

Patented Oct. 9, 1906.

Application filed October 7, 1905. Serial No. 281,771.

To all whom it may concern.-

Be it known that we, ARTHUR L. BEARDS- LEY, a resident of Chicago, in the county of Cook and State of Illinois, and ANDREW H. BEARDSLEY, a resident of Elkhart, in the county of Elkhart and State of Indiana, citizens of the United States of America, have invented certain new and useful Improvements in Twist Drills and Sockets, of which the following is a specification.

Our invention relates to improvements in twist drills and sockets therefor, and has for its object the improvement of these parts in such manner as to better adapt them to withstand the strains placed thereon in ordinary use, while permitting of the employment of said parts in interchangeable connection with twist drills and sockets in ordinary use. The conditions under which these articles are usually employed subject them to severe and unintelligent handling and to actual misuse by the workmen, and in consequence it is important to fortify the construction in every way, while maintaining the parts of the simplest form possible.

It is particularly desirable to make the shank of the twist-drill strong and symmetrical in form, and likewise its receivingsocket should be symmetrical, although much more easily strengthened to withstand the twisting strains than is the smaller body of metal forming the shank of the drill. An experience much too common with these articles is the twisting off of the flattened tang while the engaging walls of the socket are liable to be reamed out, finally permitting the drill-shank to turn therein. This occurs with the construction commonly now in use, which affords a short flattened tang at the upper end of the tapering drill-shank, which is adapted to be received by the correspondingly-shaped drill-socket. Our improvements have followed this general type of construction, one good reason therefor being the ability to employ either the drill or socket with standard parts now upon the market and widely used. These improvements, briefly stated, consist in forming near the up per end of the drill-shank a second muchheavier tang, which coacts with a correspondingly-enlarged slot provided in the drillsocket to securely hold the drill against rotation therein. With these general requirements in mindour improvements can now be very readily grasped by making reference to the accompanying drawings, illustrating embodiments of our invention, wherein Figure 1 is a view in side elevation of the upper portion of a twist drill and socket constructed in accordance with our invention. Fig. 2 is a similar view of the shank of the twist-drill removed from its socket and rotated slightly to show the double tangs formed thereon. Figs. 3, 4, and 5 are sections taken through the drill-socket respectively upon lines 3 3, 4, 4 and 5 5, Fig. 1 and Fig. 6 is a view, partially broken away, designed to show the interchangeable character of our improved construction.

Throughout the several figures of the drawings, we have employed the same character of reference to indicate similar parts.

Referring first to the twist-drill shown in Fig. 2, it will be seen that the same is provided with the ordinary cylindrical and slightly-tapering shank portion a, which terminates at the top in the usual but elongated flattened end portion or tang b, which parts are designed to engage coacting surfaces within a standard receiving-socket when the drill is forced home. Intermediate of the tapering shank and the tang is provided a shorter but heavier secondary tang c, which materially assists in withstanding the strain imparted to the drill. This secondary tang may well be from one and one-half to twice again as thick as the tang is ordinarily constructed upon twist-drills,- and while relatively of short length in the preferred interchangeable form shown said secondary tang provides a relatively large body of metal to take up the twisting strain during the use of the drill. Moreover, the construction provided is entirely symmetrical, thus permitting the drill-shank to be inserted in the standard types of chuck now in use. Preferably these double tangs are made of graduated standard sizes for this reason. In the drill-socket d is provided a taper-bored sleeve for receiving the closely-fitting shank a, said sleeve terminating above in two transverse slots 6 and f, respectively corresponding in size to the width of the tangs b and c. The said walls of these slots obviously may be formed of sufficient thickness to withstand any normal strain placed thereon, and the parts are so proportioned as to closely embrace 0r grasp the double tangs of an inserted drill-shank and maintain the drill against rotation within the socket. This construction, it should be noted, does not re uirethe taper bore of the sleeve to be cut y transverse slots or involve the use of a key or feather integral therewith or driven within the bore to assist in' maintaining the shank against rotation. The socket may well be formed with a flattened tang g and secondary tang h and a tapered exterior sleeve portion j, as upon the drill-shank, in order that the same may be inserted within a drill-socket of successively larger size, although it will be appreciated that this is merely carrying our invention a step farther in applying it to the tang portion of the drill-socket as well.

In Fig. 6 we have illustrated a portion of a standard drill-socket 7c, partially broken away and with one of our improved drillshanks inserted therein to indicate the interchangeable character of the parts constructed in accordance with our invention From this figure, too, it will. be appreciated that the drill may as readily be removed from our improved socket as from a standard socket simply by inserting a key or wedge in the up per part of slot 6 and hitting it sharply with a hammer to force the drill from its seat.

Having now described an embodiment of our invention, we claim as new, and desire to secure by Letters Patent, the following:

1. In a receiving-socket for rotary tools, a socket member having a slightly-tapering recess or bore terminating in communicating recesses having symmetrically positioned and substantially parallel side walls of successively-reduced separation adapted to engage corresponding symmetrical tangs upon an inserted tool part, substantially as set forth.

2. In a rotary tool, a surmounting cylindrical shank portion terminating in two flattened symmetrical tangs, the inner one of which is of greater cross-section and the outer one of a standard size, whereby said tool is adapted to be inserted in specialized or in standard receiving-chucks, substantially as set forth.

Signed at Chicago, Illinois, this 28th day of September, 1905.

ARTHUR L. BEARDSLEY.

Witnesses:

HARRY W. MONS, OMER S. HUNT.

Signed at Elkhart, Indiana, this 2d day of October, 1905. I

ANDREW H. BEARDSLEY.

Witnesses OHAs. E. CLARKE, GEO. W. BUTLER. 

